package com.lagou.sort;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.CombineTextInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

public class SortDriver {
    public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException, URISyntaxException {

        // 1. 获取配置文件对象，获取job对象实例
        final Configuration configuration = new Configuration();
        final Job job = Job.getInstance(configuration, "SortDriver");
        // 2. 指定程序jar的本地路径
        job.setJarByClass(SortDriver.class);
        job.setJobName("mysort");
        // 3. 指定Mapper/Reducer类
        job.setMapperClass(SortMapper.class);
        job.setReducerClass(SortReducer.class);
        // 5. 指定最终输出的kv数据类型
        job.setOutputKeyClass(LongWritable.class);
        job.setOutputValueClass(LongWritable.class);

        job.setInputFormatClass(CombineTextInputFormat.class);
        CombineTextInputFormat.setMaxInputSplitSize(job, 1024*1024*4);//4M
        //指定读取数据的原始数据
        FileInputFormat.setInputPaths(job, new Path("D:\\mysort"));
        //  7. 指定job输出结果路径
        FileOutputFormat.setOutputPath(job, new Path("D:\\outsort"));//指定结果数据输出路径
        //  8. 提交作业
        final boolean falg = job.waitForCompletion(true);
        //jvm退出: 正常退出0，非0值则是错误退出
        System.exit(falg? 0 :1);
    }
}
